Immoral Omegaverse

[Although it is wrong to cross this line...] Omega Yuzuru decides to marry beta Shinji at the age of 18 on the recommendation of his parents. Since then, and for 10 years they have posed as a couple, while their loveless relationship is sustained only by sex. One day, while shopping on Shinji's behalf, he was suddenly called out in the middle of the city. The moment the person approaches, Yuzuru loses control and goes into heat. Then she realizes that she had found her alpha, Kanata, her "destined mate" whom she should never have found. In her head, she knew it was wrong, but by instinct she followed him...